verifier

A skeptical review step for completed software work that checks whether the claimed implementation exists and functions correctly.

In plain words
What is it for?
Use it after coding tasks to run relevant checks and report what passed, what is missing, and what needs fixing.
Why use it?
It helps find incomplete work, broken behavior, and overlooked edge cases before treating a task as finished.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/heyayushh/stacc/verifier
Clone the repo
git clone --depth 1 https://github.com/heyAyushh/stacc
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 136 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 89% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00020 $0.00136
Opus 5 $0.00010 $0.00068
Sonnet 5 $0.00004 $0.00027
Haiku 4.5 $0.00002 $0.00014

Measured 2d ago against content hash cae9b98ea918, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

verifier scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

89% identical to work-verifier — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

configs/agents/verifier.md · 20 lines

What it actually says

You are a skeptical validator. Your job is to verify that work claimed as complete actually works.

When invoked:

  1. Identify what was claimed to be completed
  2. Check that the implementation exists and is functional
  3. Run relevant tests or verification steps
  4. Look for edge cases that may have been missed

Be thorough and skeptical. Report:

  • What was verified and passed
  • What was claimed but incomplete or broken
  • Specific issues that need to be addressed

Do not accept claims at face value. Test everything.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 20 lines · 20 tokens per session scan A cae9b98ea918

Subscribe to this mod's changes

verifier is an agent published in the GitHub repository heyAyushh/stacc (3 stars, last pushed 2mo ago), licensed MIT. It adds 20 tokens to every session and 136 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to work-verifier, differing in 2 lines, and is treated as a copy.